It sounds like you just want to be able to give individuals some 'ranks'/'titles' that you pick and that they really have nothing to do with 'ranks' themselves? If so, you may want to create a new Profile Field that is not editable by the user and is private. Then enter some image name - image.png - into the field for those that deserve this new image. Then just put in the postbit something like"
HTML Code:
<vb:if condition="$post['fieldx']"><img src="path/to/images/{vb:raw post.field2}" alt="something" height="yyy" width="zzz" ></vb:if>
I've never tried this, so I don't know if it works. Try it on your test site before implementing it on your live site.